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    <title>简单加减法趣味活动</title>
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    <h1>简单加减法趣味游戏与活动</h1>

    <div class="tip">
        <strong>教学理念：</strong>通过实物操作和生活情境，帮助孩子理解加减法的实际意义，建议每天练习10-15分钟，重点培养"合起来是加，拿走是减"的思维模式。
    </div>

    <div class="activity">
        <span class="difficulty">★☆☆</span>
        <h2 class="activity-title">1. 魔法水果篮</h2>
        <div class="materials">
            <strong>材料准备：</strong>水果玩具/实物水果(5-10个)、篮子、数字卡片(1-5)
        </div>
        <div class="steps">
            <h3>活动步骤：</h3>
            <ol>
                <li>篮子里放2个苹果，再放入1个："现在有<math-concept>2+1=3</math-concept>个"</li>
                <li>拿出数字卡片"3"放在旁边</li>
                <li>吃掉1个："3个苹果吃掉1个还剩<math-concept>3-1=2</math-concept>"</li>
                <li>让孩子自己创造加减法故事</li>
            </ol>
        </div>
        <div class="variation">
            <strong>变化玩法：</strong>用不同种类水果练习组合加减
            <br><span class="age">适合年龄：4-5岁</span>
        </div>
    </div>

    <div class="activity">
        <span class="difficulty">★☆☆</span>
        <h2 class="activity-title">2. 跳格子算术</h2>
        <div class="materials">
            <strong>材料准备：</strong>粉笔、空地、骰子
        </div>
        <div class="steps">
            <h3>活动步骤：</h3>
            <ol>
                <li>地上画10个格子，标数字1-10</li>
                <li>起点站第2格，掷骰子得3："<math-concept>2+3=5</math-concept>"跳到5</li>
                <li>下次掷到2："<math-concept>5-2=3</math-concept>"退回3</li>
                <li>先到10格者胜，过程中大声说出算式</li>
            </ol>
        </div>
        <div class="variation">
            <strong>变化玩法：</strong>增加"++"格（多跳1格）或"--"格（退1格）
            <br><span class="age">适合年龄：5-6岁</span>
        </div>
    </div>

    <div class="activity">
        <span class="difficulty">★★☆</span>
        <h2 class="activity-title">3. 乐高数学塔</h2>
        <div class="materials">
            <strong>材料准备：</strong>乐高积木、数字卡片、白板笔
        </div>
        <div class="steps">
            <h3>活动步骤：</h3>
            <ol>
                <li>搭建2块红积木和3块蓝积木</li>
                <li>数总数："<math-concept>2+3=5</math-concept>"写等式</li>
                <li>拆掉一些："5块拿走2块剩<math-concept>5-2=3</math-concept>"</li>
                <li>用不同颜色组合创造新算式</li>
            </ol>
        </div>
        <div class="variation">
            <strong>变化玩法：</strong>规定总高度（如8层），自由组合颜色
            <br><span class="age">适合年龄：5-6岁</span>
        </div>
    </div>

    <div class="activity">
        <span class="difficulty">★★☆</span>
        <h2 class="activity-title">4. 购物小达人</h2>
        <div class="materials">
            <strong>材料准备：</strong>玩具商品、价签(1-5元)、玩具钞票
        </div>
        <div class="steps">
            <h3>活动步骤：</h3>
            <ol>
                <li>苹果2元+香蕉3元："总共<math-concept>2+3=5</math-concept>元"</li>
                <li>给10元："应该找回<math-concept>10-5=5</math-concept>元"</li>
                <li>调整商品组合计算新价格</li>
                <li>制作"今日特价"海报（原价-折扣）</li>
            </ol>
        </div>
        <div class="variation">
            <strong>变化玩法：</strong>设置"买二送一"等促销规则
            <br><span class="age">适合年龄：5-6岁</span>
        </div>
    </div>

    <div class="activity">
        <span class="difficulty">★★★</span>
        <h2 class="activity-title">5. 算术保龄球</h2>
        <div class="materials">
            <strong>材料准备：</strong>空塑料瓶(10个)、皮球、数字贴纸(1-10)
        </div>
        <div class="steps">
            <h3>活动步骤：</h3>
            <ol>
                <li>每个瓶子贴不同数字</li>
                <li>击倒数字2和3的瓶子："<math-concept>2+3=5</math-concept>分"</li>
                <li>下一轮击倒数字5："<math-concept>5-5=0</math-concept>清空分数"</li>
                <li>累计得分最先达20分者胜</li>
            </ol>
        </div>
        <div class="variation">
            <strong>变化玩法：</strong>红色瓶子分数翻倍
            <br><span class="age">适合年龄：6-7岁</span>
        </div>
    </div>

    <div class="activity">
        <span class="difficulty">★★★</span>
        <h2 class="activity-title">6. 神秘数学箱</h2>
        <div class="materials">
            <strong>材料准备：</strong>不透明箱子、小物品(纽扣/积木等)、加减法题卡
        </div>
        <div class="steps">
            <h3>活动步骤：</h3>
            <ol>
                <li>箱中放5个纽扣，抽出题卡"+3"</li>
                <li>再放入3个："现在有<math-concept>5+3=8</math-concept>个"</li>
                <li>新题卡"-4"："<math-concept>8-4=4</math-concept>"验证</li>
                <li>创造"加减法故事"（如小鸟飞走/飞来）</li>
            </ol>
        </div>
        <div class="variation">
            <strong>变化玩法：</strong>两人轮流出题给对方做
            <br><span class="age">适合年龄：6-7岁</span>
        </div>
    </div>

    <div class="tip">
        <strong>加减法发展阶段：</strong>
        <ul>
            <li><strong>4-5岁：</strong>实物操作水平（看得见的加减）</li>
            <li><strong>5-6岁：</strong>形象思维水平（能用图画表示）</li>
            <li><strong>6-7岁：</strong>抽象思维水平（直接计算数字）</li>
        </ul>
    </div>

    <div class="tip">
        <strong>常见问题指导：</strong>
        <ul>
            <li><strong>混淆加减：</strong>多用"合起来/分开"等生活化语言</li>
            <li><strong>数手指依赖：</strong>提供实物过渡到半具体（如圆点卡）</li>
            <li><strong>忘记进位：</strong>用串珠等教具演示"满十进一"</li>
            <li><strong>缺乏兴趣：</strong>结合孩子喜欢的主题（恐龙数学/公主算术）</li>
        </ul>
    </div>
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